20CrMnTi钢热压缩实验研究
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摘要
使用Gleeble-1500D热模拟试验机对20CrMnTi钢进行等温压缩实验,选择应变速率为0.01、0.1、1和5 s-1,变形温度为900℃、950℃、1 000℃、1 050℃和1 100℃;通过金相观察,分析了变形参数对流变应力的影响;采用Arrhenius型模型建立流变应力本构方程。结果表明,20CrMnTi钢动态再结晶的显微组织受变形条件影响显著;流变应力随变形温度升高而减小,随应变速率的提高而增大;用Arrhenius型方程描述20CrMnTi钢热变形行为时,其变形激活能Q为327.874 9 k J/mol。
The hot compression tests of 20 CrMnTi steel were performed? using Gleeble-1500 D machine.The strain rates were0.01,0.1,1 and 5 s-1and the temperatures were 900,950,1 000,1 050 and 1 100 ℃.The effects of parameters on flow stress were analyzed via microscopic examination.The results show that the deformation conditions have significant effects on the microstructure of 20 CrMnTi steel after dynamic recrystallization.The flow stress decreases as deformation temperature increases and increases with the increase of strain rate.The deformation activation energy of 20 CrMnTi steel during hot deformation is327.8749 k J / mol by Arrhenius equation.
The hot compression tests of 20 CrMnTi steel were performed? using Gleeble-1500 D machine.The strain rates were0.01,0.1,1 and 5 s-1and the temperatures were 900,950,1 000,1 050 and 1 100 ℃.The effects of parameters on flow stress were analyzed via microscopic examination.The results show that the deformation conditions have significant effects on the microstructure of 20 CrMnTi steel after dynamic recrystallization.The flow stress decreases as deformation temperature increases and increases with the increase of strain rate.The deformation activation energy of 20 CrMnTi steel during hot deformation is327.8749 k J / mol by Arrhenius equation.
引文
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[2]Lin Y C,Chen M S,Zhong J.Constitutive modeling for elevated temperature flow behavior of 42Cr Mo steel[J].Computational Materials Science,2008,42(3):470—477.
[3]史宇麟,赵俊伟,陈学文.45Cr4Ni Mo V钢热变形行为的研究[J].矿山机械,2010,38(22):27—30.
[4]Mandal S,Rakesh V,Sivaprasad P V,et al.Constitutive equations to predict high temperature flow stress in a Ti-modified austenitic stainless steel[J].Materials Science and Engineering A,2009,500(1-2):114—121.
[5]刘宁,王立民,陈礼清,等.403Nb钢高温热压缩变形条件下的流变应力研究[J].塑性工程学报,2008,15(3):114—118.
[6]陈拂晓,郭云汉,郭俊卿,等.AZ31B镁合金热压缩力学行为与本构方程建立[J].锻压技术,2011,36(5):144—148.
[7]张小刚,潘清林,梁文杰,等.01570铝合金热压缩变形的流变应力本构方程[J].锻压技术,2009,34(1):139—142.
[8]Cai Z W,Chen F X,Guo J Q.Constitutive model for elevated temperature flow stress of AZ41M magnesium alloy considering the compensation of strain[J].Journal of Alloys and Compounds,2015,648(c):215—222.
[9]夏玉峰,赵磊,余春堂,等.42Cr Mo钢动态再结晶的临界条件[J].材料热处理学报,2013,34(4):74—79.
[10]崔闯,王金辉,王明亮,等.Si Cp/6061Al复合材料热变形行为及微观组织[J].材料热处理学报,2014,35(4):34—39.
[11]余晖,Kim Youngmin,于化顺,等.Mg-Zn-Zr-Ce合金高温变形行为与热加工性能研究[J].金属学报,2012,48(9):1123—1131.